TCP Installment Sales · Updated November 2026

Installment Sale: How Much of Each Payment Is Gain?

Each qualifying principal payment contains a gain portion and a basis-recovery portion. Interest is separate.

Step 1: gross profit

Calculate gross profit from selling price less adjusted basis and applicable selling costs as required by the problem.

Step 2: gross profit percentage

Gross profit ÷ contract price = gross profit percentage.

Step 3: apply to collections

Multiply qualifying principal payments by the gross profit percentage to determine the gain portion. The remainder generally represents basis recovery.

Interest

Interest income is separate from installment-sale gain and should not be included in the gross profit percentage.

Depreciation recapture

Certain recapture generally must be recognized currently rather than deferred under the installment method.

The takeaway

Principal is split between gain and basis recovery. Interest stands on its own.

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FAQ

Is the entire payment taxable gain?

No.

Is interest included in gross profit percentage?

No.

Can depreciation recapture be deferred?

Certain recapture generally must be recognized immediately.